[1] Chungbuk Natl Univ Hosp, Dept Family Med, Cheongju, South Korea
[2] Yonsei Univ, Yongin Severance Hosp, Dept Family Med, Coll Med, Yongin, South Korea
[3] Kyung Hee Univ, Coll Med, Dept Family Med, Seoul, South Korea
[4] Korea Univ, Dept Family Med, Coll Med, Seoul, South Korea
[5] Hallym Univ, Dept Family Med, Kangnam Sacred Heart Hosp, Seoul, South Korea
[6] Bundang Jesaeng Hosp, Dept Family Med, Seongnam, South Korea
[7] Haengbokhankajung Clin, Dept Family Med, Seoul, South Korea
[8] Korea Univ, Dept Family Med, Guro Hosp, Seoul, South Korea
[9] Konkuk Univ, Sch Med, Dept Family Med, Med Ctr, Seoul, South Korea
[10] Myongji Hosp, Dept Family Med, Goyang, South Korea
[11] SMG SNU Boramae Med Ctr, Dept Family Med, Seoul, South Korea
[12] Yonsei Univ, Severance Hosp, Dept Family Med, Coll Med, Seoul, South Korea
[13] Kyung Hee Univ, Coll Med, Elderly Frailty Res Ctr, Dept Family Med, Seoul, South Korea
[14] Univ Nevada, Sch Med, Las Vegas, NV 89154 USA
[15] Natl Hlth Insurance Corp, Dept Family Med, Ilsan Hosp, Goyang, South Korea
[16] Chungbuk Natl Univ, Dept Family Med, Coll Med, Cheongju, South Korea